Small perennial herb forming small to large and extensive moss-like mats; stems prostrate, rooting at nodes, scarcely ascending at tips, much-branched. Lvs connate at base, 0.7-2.8 × 0.3-0.6 mm, c. 0.3 mm thick, linear-oblong or linear-lanceolate, flattened above, convex beneath; apex acute. Fls solitary in lf axils, star-like, 4-merous, 2.2-3 mm diam.; pedicels c. 0.5-1.3 mm long, elongating to c. 2 mm at fruiting. Calyx lobes 0.5-0.7 × c. 0.5 mm, broadly triangular-ovate, ± obtuse or apiculate. Petals 1-1.4 × c. 0.6 mm, narrowly elliptic-ovate, white with pink flush, subacute, > calyx. Scales 0.3-0.5 mm long, narrowly to broadly cuneate. Follicles smooth. Seed 0.4-0.5 mm long.
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